//******************************************************************************
// CZoomer.java:	Applet
// F. Permadi 1996
//******************************************************************************
import java.applet.*;
import java.awt.*;

//==============================================================================
// Main Class for applet CZoomer
//==============================================================================
public class CZoomer extends Applet implements Runnable
{
	Thread	 mCZoomer = null;
	Graphics mOffScrGraphics;
	Image	 mImage;
	Image	 mOffScrImage;
	int 	 mImgWidth, mImgHeight;
	int		 mScaledWidth, mScaledHeight;
	int		 mDirection, mSpeed;
	boolean mLoaded=false;

	//-------------------------------------------------------------------------
	// destroy() is called when when you applet is terminating and being unloaded.
	//-------------------------------------------------------------------------
	public void destroy()
	{
		// TODO: Place applet cleanup code here
		mImage=null;
	}


	//--------------------------------------------------------------------------
	// CZoomer Paint Handler
	//--------------------------------------------------------------------------
	public void update(Graphics g)
	{
		if (!mLoaded)
		{
			Font font1=new Font("TimesRoman", Font.BOLD, 15);
			g.setFont(font1);
			g.setColor(getForeground());
			g.drawString("Loading image...",10,size().height/2);
		}
		mOffScrGraphics.setColor(getBackground());
		mOffScrGraphics.fillRect(0,0,size().width,size().height);

	    	mOffScrGraphics.drawImage(mImage,(size().width-mScaledWidth)/2,
	        	(size().height-mScaledHeight)/2, mScaledWidth, mScaledHeight,this);
	        g.drawImage(mOffScrImage,0,0,this);
	}

	//--------------------------------------------------------------------------
	//		The start() method is called when the page containing the applet
	// first appears on the screen.
	//--------------------------------------------------------------------------
	public void start()
	{
		if (mCZoomer == null)
		{
			mCZoomer = new Thread(this);
			mCZoomer.start();
		}
	}

	//--------------------------------------------------------------------------
	//		The stop() method is called when the page containing the applet is
	// no longer on the screen.
	//--------------------------------------------------------------------------
	public void stop()
	{
		if (mCZoomer != null)
		{
			mCZoomer.stop();
			mCZoomer = null;
		}
	}

	//--------------------------------------------------------------------------
	//		The run() method is called when the applet's thread is started. 
	//--------------------------------------------------------------------------
	public void run()
	{
		repaint();
		String speed=getParameter("speed");
		if (speed==null)
			speed="5";
		mSpeed=new Integer(speed).intValue();

		String strImage=getParameter("imageFileName");
	    	mImage = getImage(getCodeBase(), strImage);

   		// Load the image
   		MediaTracker tracker = new MediaTracker(this);
        	tracker.addImage(mImage, 0);

  		// Wait until image is fully loaded
	        showStatus("Loading image " + strImage);
		try
		{
			tracker.waitForAll();
		}
		catch (InterruptedException e)
		{
		}
        	showStatus("");

		// get image width and height.
		mImgWidth  = mImage.getWidth(this);
		mImgHeight = mImage.getHeight(this);

		mOffScrImage=createImage(size().width, size().height);
	    	mOffScrGraphics=mOffScrImage.getGraphics();

		mScaledWidth=size().width;
		mScaledHeight=size().height;
		mDirection=-mSpeed;
		mLoaded=true;

		while (true)
		{
			repaint();

			try
			{
				Thread.sleep(50);
			}
			catch (InterruptedException e)
			{
			}
			mScaledWidth+=mDirection;
			mScaledHeight+=mDirection;

			if (mDirection==-mSpeed)
			{
				if (mScaledWidth<=5 || mScaledHeight<=5)
					mDirection=mSpeed;
			}
			else if (mDirection==mSpeed)
			{
				if (mScaledWidth>=size().width || mScaledHeight>=size().height)
					mDirection=-mSpeed;
			}
		}
	}
}